摘要
根据已获得的最新 Ｇ Ｐ Ｓ 观测资料，利用有限元方法反演华北地区现今构造应力场。反演结果表明，华北地区现今构造应力场除受５５°～２３５°方向的压应力外，同时还受到１４０°～３２０°方向的拉应力，其中 Ｎ Ｅ－ Ｓ Ｗ 向的压应力最大，约为 Ｓ Ｅ－ Ｎ Ｗ 向的２ 倍。认为这一应力场是２ 种动力学过程的叠加，一是印度板块和太平洋板块的挤压，其中来自印度洋板块的作用力最大，约为太平洋板块作用力的１ ．５ 倍；另一个是因地幔隆起而产生的 Ｎ Ｗ － Ｓ Ｅ
On the basis of available data of GPS, the present tectonic stress field in north China region was presented by means of the finite element method. The result shows that the present tectonic stress field results from 140°～320°trending tensile stress in addition to 55°～235°_trending pressure stress which is twice as large as the former.The 55°～235°trending pressure stress seems to be mainly due to the pressure of the Pacific plate and the Indian plate whose driving force is 1.5 times higher than that of the Pacific plate .The SE～NW trending tensile stress is related to the tensive mechanism resulting from the upheaval of upper mantle.
基金
国家自然科学基金
华北GPS地形变监测网建设联合资助
关键词
华北地区
GPS
观测资料
构造应力场
North China region GPS data inversion tectonic stress field
